"Buildings and the built environment account for nearly 50% of all carbon emissions globally, according to Architecture 2030. Building operations contributes about 27% of emissions, while buildings materials and construction, and other construction industry energy use are estimated to account for another 20%. This represents an opportunity for buildings to be made more efficiently, and to adopt innovative technologies to generate emissions-free electricity.
BASF Corporation is currently testing the Aeromine system at a manufacturing plant in Wyandotte, Michigan. The patented technology was validated through joint research with Sandia National Laboratories and Texas Tech University."

what the point of talking about the co2 emission of construction when solar or wind rooftop power generation won't change anything about that? the co2 emission of appartment or house is because of their construction itself and after that their energy consumption, gas powered heating or worse oil

even with an electricity grid completly free of gas or coal (nuclear, hydro, solar and wind) the only way to reduce co2 is to lower the amont of heating or the use of air conditioner

solar and wind rooftop is interesting for being energy-independant if it's cheaper to install and maintain than 5year worth of paying the energy bill, if you can afford the cost, no need to lie and brand it as ecologic, also it's worth to mention the material used to make every rooftop of every occidental country able to generate power isn't really "ecological" far better to build a few nuclear plan than waste an absurd amont of ressource, for ecology at least